<template>
 <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 头部警告区域 -->
        <el-alert
            title="注意:只允许为第三级分类设置相关参数！"
            type="warning" :closable="false" show-icon> 
        </el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_style">
            <el-col>
                <span>选择商品分类: </span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                    expand-trigger="hover"
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"
                    >
                </el-cascader>
            </el-col>
        </el-row>
        <!-- tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" 
            name="many">
                <el-button type="primary" size="mini" 
                :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe> 
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals"
                            :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>

                            <!-- 动态编辑标签 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <el-button v-else class="button-new-tag" 
                            size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="序号"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" size="mini" 
                            icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger"  size="mini"
                            icon="el-icon-selete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" 
            name="only">
                <el-button type="primary" size="mini" 
                :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <!-- 静态属性表格 -->
                <el-table :data="onlyTableData" border stripe> 
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item,i) in scope.row.attr_vals"
                            :key="i" closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>

                            <!-- 动态编辑标签 -->
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                            </el-input>
                            <el-button v-else class="button-new-tag" 
                            size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index" label="序号"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" size="mini" 
                            icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger"  size="mini"
                            icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="40%" @close="addDialogClosed">
        <!-- 添加参数对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="40%" @close="editDialogClosed">
        <!-- 添加参数对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
 </div>
</template>
<script>
 export default {
     data(){
         return {
            //商品分类列表
            catelist:[],
             //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            //被激活的页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态属性的数据
            onlyTableData:[],
            addDialogVisible:false,
            addForm:{
                attr_name:''
            },
            addFormRules:{
                attr_name:[
                    {required:true, message:'请输入参数名称', 
                     trigger:'blur'}
                ]
            },
            editDialogVisible:false,
            editForm:{},
            editFormRules:{
                attr_name:[
                    {required:true, message:'请输入参数名称', 
                     trigger:'blur'}
                ]
            },
            
         }
     },
     created(){
         this.getCateList()
     },
     methods:{
         //获取所有的商品分类列表
         async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return  this.$message.error('获取商品分类失败')
            }
            this.catelist=res.data

         },
         //级联选择框变化会触发这个函数
         handleChange(){
            this.getParamsData()

         },
         //tab页签的点击事件处理函数
         handleTabClick(){
             this.getParamsData()
         },
         async getParamsData(){
            if(this.selectedCateKeys.length!==3){
                 this.selectedCateKeys=[]
                 this.manyTableData=[],
                 this.onlyTableData=[]
                 return 
            }
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{
                    sel:this.activeName
                }
            })
            if(res.meta.status!==200){
                return  this.$message.error('获取参数列表失败！')
            }

            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals ? item.attr_vals.split(' ') : []

            item.inputVisible=false,
            item.inputValue=''

            })
            console.log(res.data)

            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
         },
         addDialogClosed(){
             this.$refs.addFormRef.resetFields()
         },
         addParams(){
             this.$refs.addFormRef.validate(async valid=>{
                 if(!valid) return 
                 const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                     attr_name: this.addForm.attr_name,
                     attr_sel: this.activeName
                 })
                 if(res.meta.status!==201){
                     return  this.$message.error('添加参数失败')
                 }
                  this.$message.success('添加参数成功')
                  this.addDialogVisible=false
                  this.getParamsData()
             })
         },
         async showEditDialog(attr_id){
             const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                 params:{
                     attr_sel:this.activeName
                 }
             })
             if(res.meta.status!==200){
                 return  this.$message.error('获取参数信息失败')
             }
             this.editForm=res.data
             this.editDialogVisible=true
         },
         editDialogClosed(){
             this.$refs.editFormRef.resetFields()
         },
         editParams(){
             this.$refs.editFormRef.validate(async valid=>{
                 if(!valid) return
                 const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                     attr_name:this.editForm.attr_name,
                     attr_sel:this.activeName
                 })
                 if(res.meta.status!==200){
                     return  this.$message.error('修改参数失败')
                 }
                  this.$message.success('修改参数成功')
                  this.getParamsData()
                  this.editDialogVisible=false
             })
         },
         async removeParams(attr_id){
            const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err=>err)

            if(confirmResult!=='confirm'){
                return this.$message.info('已取消')
            }
            const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!==200){
                     return  this.$message.error('删除参数失败')
                 }
                  this.$message.success('删除参数成功')
                  this.getParamsData()
         },
         //文本框失去焦点或enter键被按下
         async handleInputConfirm(row){
             if(row.inputValue.trim().length ===0 ){
                row.inputValue=''
                row.inputVisible=false
                return
             }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //发起请求保存操作
            this.saveAttrVals(row)

         },
         async saveAttrVals(row){
             //发起请求保存操作
             const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return  this.$message.error('修改参数失败')
            }
            this.$message.success('修改参数成功')
         },
         showInput(row){
            row.inputVisible=true
            //文本框自动获得焦点
            //nextTick，当页面上元素被重新渲染之后执行回调函数
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
         },
         //删除对应的参数可选项
         handleClosed(i,row){
             row.attr_vals.splice(i,1)
             this.saveAttrVals(row)

         }
     },
     computed:{
         //计算属性，用于按钮的启用/禁用
         isBtnDisabled(){
             if(this.selectedCateKeys.length!==3){
                 return true
             }
             return false
         },
         //当前选中的三级分类的id
         cateId(){
             if(this.selectedCateKeys.length==3){
                 return this.selectedCateKeys[2]
             }
             return null
         },
         //动态计算标题文本
         titleText(){
             if(this.activeName==='many'){
                 return '动态参数'
             }
             return '静态属性'
         },
         
     }

 }
 </script>
<style lang="less"   scoped>
.cat_style{
    margin: 15px 0px;
}
.el-tag{
    margin: 5px;
}
.input-new-tag{
    width: 120px;
}
</style>